Signal unit for an audible alarm



FIG. 1 is a top view of a signal unit for an audible alarm embodying our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a perspective view as viewed from the upper side thereof;

FIG. 8 is a perspective view as viewed from the lower side thereof;

FIG. 9 is an exploded perspective view as viewed from the upper side thereof;

FIG. 10 is an exploded perspective view as viewed from the lower side thereof;

FIG. 11 is a sectional view taken along a line A--A of FIG. 2;

FIG. 12 is a sectional view taken along a line B--B of FIG. 2; and,

FIG. 13 is a sectional view taken along a line C--C of FIG. 5. 

The ornamental design for a signal unit for an audible alarm, as shown and described. 